<template>
  <div >
  <router-link  tag='div' to="/" class="header-abs " v-show="showAbs" >
    <div class="iconfont header-abs-backicon" >&#xe624;</div>
  </router-link>
  <div class="header-fix" v-show="!showAbs" :style="opacityStyle">
      <router-link to="/" >
        <div class="iconfont header-fix-back" >&#xe624;</div>
      </router-link>
    景点详情
  </div>
  </div>
</template>

<script>
export default {
  name: 'DetailHeader',
  data () {
    return {
      showAbs: true,
      opacityStyle: {
        opacity: 0
      }
    }
  },
  props: {
    list: Array
  },
  methods: {
    handleScroll () {
      const top = document.documentElement.scrollTop
      if (top > 60) {
        let opacity = top / 140
        opacity = opacity > 1 ? 1 : opacity
        this.opacityStyle = { opacity }
        this.showAbs = false
      } else {
        this.showAbs = true
      }
    }
  },
  mounted () {
    window.addEventListener('scroll', this.handleScroll)
  },
  unmounted () {
    window.removeEventListener('scroll', this.handleScroll)
  }
}
</script>

<style lang="stylus" scoped>
   @import "~styles/varibles.styl"
  .header-abs
    z-index: 3
    position absolute
    left:.1rem
    top:.3rem
    height .72rem
    width .72rem
    border-radius .36rem
    text-align center
    line-height .72rem
    background rgba(0,0,0,.5)
    .header-abs-backicon
      color white
      font-weight bold
      font-size .38rem
  .header-fix
    z-index: 3
    overflow hidden
    position fixed
    top 0
    left 0
    right 0
    height $headerHeight
    line-height $headerHeight
    font-size: .32rem;
    color white
    background $bgColor
    text-align center
    .header-fix-back
      font-size: .36rem
      text-align :center
      color white
      font-weight bold
      position absolute
      top:0
      left .2rem
</style>
